Lol, exactly. I feel almost silly for saying this but you're right - when I began the romance in Act 3 after waiting patiently all this time, it really stifled my joy. I no longer wanted him in my party and couldn't bear to hear him talk. It suddenly made me cringe, really badly. I hate to say it but I began rushing through the game just to end my campaign and start over again. Not kidding, that is how much he gave me the ick.
The odd monologue he gives when you ask him how the relationship is was the cherry on the crap milkshake for me. The most disingenuous line they could've made him say. And so pretentious too! Like they just wanted to add something in to really hammer it home that he's poly and different and super chill about it you guys. Nothing about it felt natural.